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What is r i 4.5+10r=-6.5 with work pls

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters

Graph the following system of linear inequalities. identify at least two points in the solution: y < 5 - 2x | x + 5y > -7